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arXiv 1104.4249q-fin.GNcs.SIphysics.soc-ph
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国际金融网络中的鲁棒性和传染性

Robustness and Contagion in the International Financial Network

Tilman Dette, Scott Pauls, Daniel N. Rockmore

摘要:

最近的2008年金融危机和2011年希腊的债务突出了理解全球金融网络结构的重要性。在本文中,我们开始分析和描述这个网络,由国际货币基金组织协调证券投资调查(CPIS),在两个方面。首先,通过对“错误和攻击”方法的修改[1],我们证明了网络是“鲁棒但脆弱”类型,这是一种在各种进化网络中发现的拓扑结构。我们将这些结果与四种常见的零模型进行比较,这些零模型仅由经验数据的一阶统计量生成。此外,我们还提出了第五个对数正态模型,它产生的网络似乎与经验模型更接近。尽管如此,该模型没有考虑到几个高阶网络统计,这加强了高阶分析的附加值。其次,使用违约损失动态[2],我们通过网络模拟金融相互依赖和潜在的金融困境级联。初步的模拟表明,像希腊这样一个相对较小的国家的违约可以被网络吸收,但如果与其他PIGS国家(葡萄牙,爱尔兰和西班牙)的违约结合起来,可能会导致全球经济的大规模灭绝级联。

英文摘要:

The recent financial crisis of 2008 and the 2011 indebtedness of Greece highlight the importance of understanding the structure of the global financial network. In this paper we set out to analyze and characterize this network, as captured by the IMF Coordinated Portfolio Investment Survey (CPIS), in two ways. First, through an adaptation of the "error and attack" methodology [1], we show that the network is of the "robust-yet-fragile" type, a topology found in a wide variety of evolved networks. We compare these results against four common null-models, generated only from first-order statistics of the empirical data. In addition, we suggest a fifth, log-normal model, which generates networks that seem to match the empirical one more closely. Still, this model does not account for several higher order network statistics, which reenforces the added value of the higher-order analysis. Second, using loss-given-default dynamics [2], we model financial interdependence and potential cascading of financial distress through the network. Preliminary simulations indicate that default by a single relatively small country like Greece can be absorbed by the network, but that default in combination with defaults of other PIGS countries (Portugal, Ireland, and Spain) could lead to a massive extinction cascade in the global economy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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